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GSSP |
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While onset of the CIE is somewhat gradual in most reported P/E sections, at the GSSP it is abrupt and begins immediately after an unusual lithologic change indicating an erosional or non-depositional hiatus. The Sandbian Stage, which is the lowermost stage of the Upper Ordovician Series, is established by its GSSP in the Fagelsang section in Scania, southern Sweden, where succession of deep shelf black shales supposedly represents a continuous record of geological time across the Middle and Upper Ordovician boundary. Careful study and extensive international discussion takes place before each GSSP is ratified, in contrast to the somewhat individual and ad hoc process that went into the development of the systems and stages in the 19th and early 20th centuries. |
GSSP |
GSSE GSSEM GSSF GSSFBA GSSFC GSSG GSSG GSSGC GSSHA GSSHC GSSHD GSSI GSSIF GSSJC GSSJP GSSL GSSLC GSSLG GSSM GSSMA GSSMC GSSMS GSSN GSSO GSSOP GSSP GSSPAGSSPL GSSPM GSSR GSSRS GSSS GSSSC GSSSS GSST GSSTA GSSU GSSUP GSSW GSSWC GSSWSR GSSWT GST GST GST GST-CTD GST-VAT Accounting GSTA GSTA3 Gstaad GSTAB GSTAMIDS | |||||
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